unused argument (file.type = "xml"）

R语言：unused argument (file.type = "xml"）该怎么解决呀？

query <- GDCquery(project = project,

•               data.category = "Clinical",
  

•             file.type = "xml")
  

  Error in GDCquery(project = project, data.category = "Clinical", file.type = "xml") :
  unused argument (file.type = "xml")

使用data. format而不是file.type

data. format="bcr xml"